If the computer or any application does not work properly after connecting the device to USB port, there may be several reasons for this. Before you can pinpoint the source of the problem, you need to check the operation of the peripheral device, USB port, or USB driver. Below we list a few simple steps, which will help you identify the problem and fix it yourself without contacting a computer wizard.To reload the USB driver and software that conflict, you just need to restart your computer. Very often this helps to fix the problem.
Sometimes a different order can help. Turn off the computer and disconnect any devices connected to the USB ports, including the keyboard and mouse. Turn on the computer again and when the operating system boots up, connect all the peripheral devices that were previously disconnected to the USB ports one by one. If when connecting specific device, for example USB RAM , there will be a problem, note for yourself on which port this happened. Try connecting this device to another free port. If the problem is gone, then the specific USB port is bad. Otherwise, the problem must be sought either in peripheral device, or in a USB cable.
USB cable and connector
In the event that the USB port does not work, very often the cause of the malfunction may be damage to the cable or connector. Carefully inspect these connection elements for damage such as cracks, chips or cuts. Look inside the USB port and connector and check for dirt, dust, or other small items. You can clean the connectors yourself with a dry brush or an air compressor (vacuum cleaner). This must be done with the cable disconnected. If the interface cable is severely bent or broken, then you should immediately replace it - a new cable costs a penny.
Delimitation of the problem - port or device
If the program or computer stops working immediately after connecting a new device to the USB port, then you should try connecting another device to it. If the computer continues to operate normally, then the problem is with the peripheral. Do you have a second computer? Try to connect a suspicious device to it and double-check its performance. If the situation repeats itself, it definitely needs to be changed. If you have used USB hub, exclude it from the connection chain. When USB problems the device must be connected directly. In addition, problems can arise if you connect a lot of peripherals at the same time or connect several devices of the same model at the same time, for example, two smartphones or printers.
Driver reinstallation
Windows usually issues a message if there is a problem with the USB driver. If this happens, open the "Control Panel" through the start menu of the operating system. Find the “Device Manager” item in it, open the utility and find the subsection “USB Controllers” or “USB Controllers” in the list of installed equipment. Expand this item and find in USB list devices the item that is marked exclamation point on a yellow background. If you find such a device, right-click on it and select context menu"Delete". Reboot your computer. After that, the operating system will automatically reinstall the removed driver immediately after it boots. If reinstalling the driver did not resolve the issue, you should try updating it.
Driver update
If the USB port is not working, you can try manually updating the USB device driver. To do this, open the "System and Security" section in the "Control Panel", in which find the "Device Manager" subsection. Enter administrator credentials if prompted by the system. Next, find the problematic USB device in the USB Controllers list and double-click on it to open the configuration dialog. Open the "Driver" tab, and in it click the "Update" button. To start the driver update, enter your system administrator credentials again. After the update, restart your computer and check the performance of the problem device. Learn how to update sound drivers if the device is integrated into the motherboard.
Question: acer extensa 2509-c1np (Z5WAL LA-B211P) USB ports not working
Good day!
They brought an acer extensa 2509-c1np laptop (Z5WAL LA‐B211P) with a problem that USB ports and usb 3.0 and 2.0 do not work. The device itself works well.
Upon examination, it turned out that there was a short circuit in the camera cable (near the camera connector) - the cable was charred, even the case burned out. According to the owner, at first the building in this place was heated strongly, and one fine day it stopped)
To fix the problem, it is necessary to change the processor in this case? Is it worth SR1W3 (N2930) or something else can affect the operation of the ports?
Thank you in advance!
Answer:
Alex7GT wrote:
If USb 2.0 does not work, there is a problem with the webcam, then the hub is most likely set on fire
Eugene973 wrote:
Per USB operation ports are answered by the hub.
what a hub bro you are stuck in the past...
Question: Gigabyte 990FXA-UD3 rev.3.0 USB ports do not work after loading Windows
The problem is the following, after turning on the computer again after loading Windows, it turned out that the mouse and keyboard did not work. Later it was found out that the USB ports do not work in principle, although they are powered (if you connect the phone, it charges). The most ordinary PS / 2 mouse was bought, but, as it turned out, the PS / 2 port also does not work, although power is supplied to it - the LED is on.
Both mouse and keyboard work in BIOS. In Windows, even safe mode no.
The BIOS version is the latest - FC. Tried to change various settings in the BIOS related to USB - did not help.
Where to dig? I don't want to reinstall the system.
Answer: everything, the problem is solved. I remembered that I was allowed to connect via RDP, logged in from the tablet and saw in the dispatcher that the firewood had completely flown to USB.
Reinstalled - earned. True, I still did not understand why PS / 2 did not work
Q: Rear usb ports not working
Good day!
Such a disaster happened. Motherboard AsRock FM2A75-DGS. Rear USB 2.0 ports do not work. I measured the voltage with a "blue tester", a doctor, there is only 2.6V. I didn’t believe it, I tried another tester (white), it didn’t show the voltage at all, it didn’t seem to have enough current, the multimeter showed the same 2.6V. The computer is a little bit plucked by current, grounded it in an artisanal way, I think, well, maybe it will help, it stopped plucking, and the ports did not work. When I just plug the system unit into the socket, the rear USB 2.0 ports have the same 2.6V, the front 5V, the rear USB 3.0 5V. worked, plugged the 3G modem into the port where the keyboard had just worked - this port fell off, the computer rebooted, rebooted for a very long time, and when it turned on, "some problem arose on your computer because of which it rebooted, do not want to send information to small soft ". At the same time, the 3G modem worked in all front ports.
And the first swallows appeared a few days before falling off. At first, when the computer was turned on, the 3G modem did not work, I switched it to another port, the computer hung, I reset it with the button, everything worked, a day later everything happened again, but before freezing, I saw a warning flashed that some USB device did not have enough power and he passed out. Then the ports stopped working altogether. What to do now, where to look for the cause? The motherboard is still under warranty, so I will not solder anything, and if there is a problem in it, I will hand it over to the service.
There are no viruses, and I don’t think it’s a software problem. Just in case Corsair CX 500 PSU, Windows 8.1 x64. There are no swollen conders on the motherboard. The PSU puts out 5V.
Answer:
Message from Hachiko
If you connect a hub with add. nutrition
Well, try it, no one forbids ...
Q: rear usb ports not working
I have an asrock 960gm/u3s3 fx motherboard. The problem is that the rear usb ports 2.0 do not work and just usb
at the same time, 3.0 works fine like the front ones, ps / 2 also do not work, there is no power for all of them. I tried to reset the BIOS and changed the settings of usb devices in every possible way, I tried to look at the motherboard for traces of damage (I'm a little "blind" in a figurative sense), in short, I didn't see any traces. Now I don't know what to do and I turn to you.
Answer: fuses
Question: 15-n031er (DA0U93MB6D0 rev.D) USB ports do not work.
Brought laptop HP 15-n031er.
M/B DA0U93MB6D0 rev.D
Problem: USB ports not working. The OS does not initialize flash drives. When starting the laptop, if a USB flash drive is inserted into the usb, it freezes.
dismantled, visible problems no. There are 2 USB 3.0 ports on the board and a USB 2.0 port is connected with a separate bracket. I rang ports 3.0 - there is no short circuit on the "read-write" channel, but on 2.0 on the Data-channel there is a short circuit.
Question: is the problem in the southbridge?
Answer: Modern54
216-0841009
am5000ibj44hm
Q: USB ports stopped working
Usb ports 2.0 stopped working, what with right side laptops connected via a cable to the n07nb10b01 board
It was like this: I dabbled with an arduino, a draver and a step dryer. The arduina was powered by a cord from the computer, the logical part of the driver from the arduina (5V), the power driver from a separate source. At some point, everything went wrong (probably overloaded, or the driver overheated) and everything was gone) The driver burned out; aruin circuit responsible for usb communication (ch340g); Well, the usb of the laptop itself.
Only this pair of ports does not work (audio jacks work). Webcam, wifi, microphone, usb 3.0 are fine. I believe the bridge is fine. There is food on the burned ports.
I took off this scarf and tested the data contacts - there is no resistance. Or it was necessary to call on the connected cable to the motherboard?
Pictures attached
Does anyone have any ideas? Previously, only soldered conders on the motherboard
I agreed with someone who has the same laptop to take this input / output board to test. I will write about the results.
Answer: Most likely this is the protection of signal lines and lines USB power supply 2.0 interfaces type PJSRV05W-4DW in SOT363 package
Question: Gigabit GA-P55-US3L 2 ram ports stopped working
Good day, the topic is this: after cleaning from dust system block 2 gigabit GA-P55-US3L lga1156 RAM ports stopped working. mother in our time is rare does not work 2 and 1 port can be seen statically struck, by occupation I need at least 8 gigs of RAM, went to the store and bought 2 planochki 1333 for 4 gigs. inserted, launched, start picture for a few seconds and reboot, tried to change the bios did not help. I didn't find anything interesting in the bios either. there are a lot of craftsmen on this forum, I hope someone will tell you something. I'm interested in whether it's possible to turn on port 1 and 2 again, or how to make it so that other bars would work, or recommend at least which ozushki manufacturers will work exactly. Thank you all in advance.
Answer: the problem is solved by installing chips with chips on both sides of the memory, thanks not indifferent
Question: Acer Aspire E1-522 (eg50-kb) USB ports not working
Good afternoon. I would like to ask knowledgeable people about Acer laptop Aspire E1-522. Problem: USB ports not working. The forum has a lot of topics on this laptop - often the culprit of the percentage, which was assigned all the work! And the only way to restore the functionality of the beech is to roll the processor chip.
It's probably the same for me, but still...
You insert a flash drive - the indicator blinks, but it is not detected (not in the BIOS, not in the system) with rare exceptions: from one port, when the system has just booted, sometimes the flash drive is detected and you can work with it ... but if you pull it out and insert it again, then that's it - deaf.
One of the ports has low resistance data- and data +
If, nevertheless, the percent is the culprit, then why is the USB flash drive sometimes determined?
Answer: the board is eg50-kb, but eg40-kb is seen in the BIOS... is this normal?
Question: USB ports stopped working!
Hello everyone, I ran into a problem, the laptop rebooted and the Uzb ports stopped working, 0 reactions to connecting something to each of the ports. in the manager it is shown that the ports are in place and nothing interferes with work. ((Who can help.
Even the most careful user desktop computer or laptop at least once encountered a situation where the USB port does not work. As a rule, this happens at the most unfortunate moment. Accordingly, there is simply no time to figure out why the USB ports do not work. Anyone who knows what the problem might be is lucky. Indeed, in this case, you can still try to eliminate the reason why the USB ports do not work. In our article, we will list what can cause interfaces to fail, and what can be done.
Source of problems
At first glance, it may seem that if the USB ports do not work, then there is only one reason for this. In fact, this is a misconception - the source of problems can be either a banal "dump" of the extension cable, or serious damage to the chip with the controller. Therefore, without a preliminary diagnosis, it is impossible to say why the USB ports do not work. Nevertheless, in no case should you panic (it will always be in time) - there is a high probability that you will be able to restore working capacity on your own. 
Connectors in a personal computer
In stationary computing systems, part of the serial bus ports is displayed on the rear panel - this is where manufacturers place the connectors by directly soldering them to the corresponding pins motherboard. Thanks to this, when connecting a USB device, no additional conductors are used. It is recommended to connect devices to these sockets. It is quite clear that this is inconvenient, especially if the system unit is located under the table. To solve this problem, it is proposed to use special extension cords: there are usually connectors on the case of the system unit, a wire comes from them, which should be connected to the comb of pins on the motherboard (the location is indicated in the instructions). It is easy to understand that the quality of the connecting wire greatly affects the functioning of the connected device - with its high resistance, the voltage drop can be critical. Thus, if the device connected to the USB connector on the case does not work, then it should be reconnected to the connectors on the back of the system unit for testing.
Settings
In all computers, both stationary and portable, there is an item in the BIOS setup program that allows you to disable or enable USB ports at the request of the user. Thus, if, for example, the USB ports on a laptop do not work, then you should first make sure that the BIOS is not banned. To enter the settings, you need to press the DEL button after turning on the computer (on laptops, this can be F2 or others).
Software bugs
To USB device could work correctly, the ports must be supported operating system. To do this, install the drivers for the motherboard (can be downloaded from the manufacturer's website). Otherwise normal work not guaranteed. If the ports do not work, then you can try reinstalling the systems - sometimes this helps.
Hardware failures
Connectors are, in fact, just metal contacts. The entire logical part is controlled by the corresponding controller located in the microcircuit on the board. If it fails, then all serial ports stop working. Most often this happens in laptops, where the cooling system does not always cope with the removal of heat from the components. Sometimes repairs are possible service center. However, before contacting the workshops, you can try to remove the battery from the laptop and plug it back in 10 - 15 minutes - in some cases this restores performance.